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-------- <br /> 7 <br /> Soil & Ground-Water Remediation System <br /> -" The soil and ground-water remediation system will initially consist of the following: <br /> • all existing ground-water monitoring wells <br /> 1 • five bioventing wells <br /> • a blower system (regenerative or positive displacement blower and associated controls) <br /> to inject atmospheric air into the subsurface. On-site location of the blower system <br /> compound has not yet been determined <br /> _-, Installation of the bioventing system would commence upon approval of a final remediation <br /> workplan, and the issue of local building and safety permits, if required. Operation and <br /> monitoring of the bioventing system will be evaluated upon completion of in-situ respiration test <br /> report. <br /> In-Situ Respiration Test <br /> i � Upon approval of the final workplan, an in-situ respiration test would necessarily be performed <br /> to evaluate bioventing effectiveness and determine the actual and appropriate number of <br /> bioventing wells by measuring soil-gas permeability and microbial activity. An in-situ <br /> " respiration test consists of placing narrowly screened soil-gas monitoring points into the <br /> unsaturated zone and venting these soils with atmospheric air for a given period of time. Four <br /> bioventing wells (BV-1 through BV-4) and a background well (BV-5) would be drilled and <br /> completed for the project and would be used for this test. <br /> After injection of atmospheric air, Oz , CO2 , and TPH-g levels will be measured at approximate <br /> E one-hour intervals for the first four hours of monitoring, then every eight hours to the end of <br /> the first day. Thereafter, measurements of OZ , CO2 , and TPH-g levels would be recorded once <br /> daily for three days depending on the results collected during the first testing-day. <br /> Oxygen, CO2 , and TPH-g levels will be measured using a Landtech GA-90 gas analyzer and <br /> a Foxboro OVA-128 or TVA-1000 utilized in the flame-ionization detector mode, or equivalent. <br /> The monitoring equipment will be calibrated with appropriate calibration gases prior to the test. <br /> SITE EVALUATION STUDY <br /> Upon final workplan approval, a comprehensive, site evaluation study will be conducted to <br /> E` determine the effectiveness of intrinsic remediation. The site evaluation study will be based on <br /> -_ an analysis of historical ground-water monitoring and sampling data collected at the subject site. <br /> j =1 <br /> i`JI <br /> -1 <br /> J <br /> WW. rutin, Inc. <br /> t Project No. 33016.07 <br /> 1 <br /> December 1995 9 <br />